GraphQL: Pipeline mutations for retry, cancel, and destroy

What does this MR do?

Adds three mutations to Pipeline:

• Destroy
• Retry
• Cancel

mutation pipelineRetry {
  pipelineRetry(input: { id: 18 }) {
    errors
    pipeline {
      id
      status
    }
  }
}

mutation pipelineCancel {
  pipelineCancel {
    errors
  }
}

mutation pipelineDestroy {
  pipelineDestroy {
    errors
  }
}

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• [-] Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides

Part 2/2 of #232739 (closed)